Method and means for using low-compression fuels



. Patented Mar. 2, 1926.

UNITED STATES,

PATENT OFFICE.

-THOMAS MID GLEY, JR., OF DAYTON, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO GENERAL MOTORS CORPORATION, OF'DETROIT, MICHIGAN, A CORPORATION OF DELAWARE.

METHOD AND MEANS FOR USING DOW-COMPRESSION FUELS.

No Drawing.

'To all whom it out co-ncem Be it known that THOMAS MmeLEY, J 11., a. citizen of the United" States of America, residing at Dayton, county of Montgomery, and State of Ohio, have invented certain new and useful Improvements in Methods and Means for Using'Low-CompressionFuels, of which the following is a. full, clear, and exact description. 1U

pressing a fuel knock when a combustible gaseous mixture containing a low compression fuel such, for'example, as kerosene and gasoline is burned under arelatively high pressure. The principal objects of this inven tion are to employ tin compounds to sup-' press the fuel knock.

. This application is a continuation'in part of my copending application Serial No. 553, 270, filed April 15,1922.

Kerosene has a critical compression pres sureof about 'pounds. The critical compression pressure of gasoline varies from about 7.5 pounds for the" commoner forms v now marketed to about 125 pounds for aviation gasoline employed inairplane engines. These fuels are termed low compression fuels. 'Whenthe vapors of any one of them is mixed with air, compressed vto a compression pressure in excess of the normal critical compremion pressure of the fuel, and burned, as in an internal combustion engine, a fuel knock is roduc'ed.

I have found t gine com burning c aracteri'stic of the fuel.

' By way of an example of one method of carrying out my invention.. I dissolvefil) c 0. of in tetraethyl. Sn('G,H in l-gallon of gasoline having a normal critical'compression pressure of about 7 5 pounds. This "solution" or high conipr'emion fuel. is fed This invention relates to the art of sup-' tvapors of tin compounds .added to the fuel-air mixture suppress this fuel knock and permit an increase in the en-';

resslon pressure with a normal 'premure of the. fuel.

through a into thecylindenof Application filed September 18, 1923. Serial No. 663,502,"

an internal combustion engine having a compression pressure of about 100 pounds, the solution being vaporized and mixed with air as is common practice in engine operation. The gaseous high'compression fuel is ignited and the engine operated without'afuel knock. The gasoline forms the fuel base and the tin compound increases the critical compression pressure of this base.

This process may be varied by changing the proportions according to'the increase in critical compression pressure desired and by using other tin compounds in place of the tin tetraethyl. Amon the tin compounds which may be employe are other alkyl com-1 pounds including tmtetramethyl and tin diethyl diiodide', -'tin tetrachloride and tintetrai'odide.

' I'prefer to employ the tin compoundswhich are soluble in the fuel to promote the mixing of the two.. Blending a entsmay be employed if the tin compoun does not dissolve readily in the fuel. The compound may be added to the fuel-air mixture just beforeithe latter is burned.

I claim 1 A composition of matter comprising a low compression fuel; and a'. volatile tin compound incorporated. therein and adapted to increase the critical compression pressure 75 ofthefuel. I v 2. A composition of inattercomprising a v lowvcompression fuel, such as kerosene on.

gasoline; and a volatile alkyl compound of v tin incorporated homogeneously therein and adapted to increase the cri compression signature. r

" 'THOMASLHDGLEY,JR.

3. A composition of matter comprising a} r 

